My air changes to heat

Customer Question

Can you provide model on outdoor unit and indoor unit and Can you feel of the large copper refrigerant line that runs between indoor and outdoor and tell me if it starts out COLD and then changes to Hot or just changes to ambient temp when this happens.

OK it is vey likely the system is low on refrigerant.That line should be as cold as a beer can out of the cooler.If not, this implies either compressor is not pumping or we are low on refrigerant.If this is the case, the outdoor unit may shut down on low pressure.After a short time when pressures in system equzlize, it will start back and run a short time. Have you noticed outdoor cycling off while still calling for cool?